The K Computer: PetaScale Computing

The K Computer is the Top500's current (6/11) supercomputer, executing 8.25 quadrillion floating-point operations per second (8.25 PetaFLOPS).

"K" stands for "10-PetaFLOPS" and the machine is almost there.

While the K computer consumes 9.89 MW (think one lightning bolt, or the energy to power 10,000 suburban homes), the computer is relatively efficient and executes 825 MFlops/watt.

Annual power bill: 10 Mega$$.

IBM's BlueGene (eh, Watson?) tops the Green500 list at 1680 MFlops/watt.